211121 has 4 divisors (see below), whose sum is σ = 214644. Its totient is φ = 207600.

The previous prime is 211097. The next prime is 211129. The reversal of 211121 is 121112.

211121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21025 + 190096 = 145^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121 - 2¹⁰ = 210097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 211099 and 211108.

It is not an unprimeable number, because it can be changed into a prime (211129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1670 + ... + 1791.

It is an arithmetic number, because the mean of its divisors is an integer number (53661).

2²¹¹¹²¹ is an apocalyptic number.

It is an amenable number.

211121 is a deficient number, since it is larger than the sum of its proper divisors (3523).

211121 is an equidigital number, since it uses as much as digits as its factorization.

211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3522.

The product of its digits is 4, while the sum is 8.

The square root of 211121 is about 459.4790528414. The cubic root of 211121 is about 59.5447959624.

Adding to 211121 its reverse (121112), we get a palindrome (332233).

Subtracting from 211121 its reverse (121112), we obtain a palindrome (90009).

The spelling of 211121 in words is "two hundred eleven thousand, one hundred twenty-one", and thus it is an iban number.